specific gravity question
jessecarlk
Posts: 646
Would two coins with the same dimensions and the same weight have the same specific gravity?
0
Comments
or a pound of lead?
Camelot
<< <i>Which weighs more, a pound of feathers
or a pound of lead? >>
A pound of lead of course.
It possible that measuring the outer dimensions of a coin will not get you an accurate volume.
Take the example where a gold coin had it's contents scooped out and replaced with (cheaper at the time) platinum. Same dimensions as measured from the outside. Same weight. Different volume. Different metals.
Generally speaking, coins with exactly the same dimensions will have the same volume.
With a few assumptions, the answer is yes.
<< <i>Which weighs more, a pound of feathers or a pound of lead? >>
The much harder question is: What weighs more, a pound of gold or a pound of feathers.
Since gold is troy and feathers is avoirdupois, a pound of feathers weigh more.
<< <i>
<< <i>Which weighs more, a pound of feathers or a pound of lead? >>
The much harder question is: What weighs more, a pound of gold or a pound of feathers.
Since gold is troy and feathers is avoirdupois, a pound of feathers weigh more. >>
They would still weigh the same.
<< <i>
<< <i>
<< <i>Which weighs more, a pound of feathers or a pound of lead? >>
The much harder question is: What weighs more, a pound of gold or a pound of feathers.
Since gold is troy and feathers is avoirdupois, a pound of feathers weigh more. >>
They would still weigh the same. >>
No, because a Troy Pound contains 12 Troy ounces, while an avoirdupois pound contains 16 ounces.
12 troy ounces = 0.822857143 pounds (avoirdupois)
To support LordM's European Trip, click here!
<< <i>Would two coins with the same dimensions and the same weight have the same specific gravity? >>
The question assumes that the item is perfectly flat on both sides.
A High Relief $20 would weigh less that a gold disc of the same fineness, same diameter and same thickness at the rim!
TD
would we be dealing with non specific
density?
Camelot
<< <i>
<< <i>
<< <i>
<< <i>Which weighs more, a pound of feathers or a pound of lead? >>
The much harder question is: What weighs more, a pound of gold or a pound of feathers.
Since gold is troy and feathers is avoirdupois, a pound of feathers weigh more. >>
They would still weigh the same. >>
No, because a Troy Pound contains 12 Troy ounces, while an avoirdupois pound contains 16 ounces.
12 troy ounces = 0.822857143 pounds (avoirdupois) >>
Lead is measured in avoidupois ounces and pounds, not troy ounces and pounds.
TD
<< <i>If one were in weightless space,
would we be dealing with non specific
density? >>
Density has nothing to do with gravity. Technically density is mass/vol, not weight/vol. --Jerry
Density of the brain = Gravity of the situation-
-----------------------------
Volume of ones bladder
Camelot
<< <i>
<< <i>Would two coins with the same dimensions and the same weight have the same specific gravity? >>
The question assumes that the item is perfectly flat on both sides.
A High Relief $20 would weigh less that a gold disc of the same fineness, same diameter and same thickness at the rim!
TD >>
The coins in question actually have the same exact designs.
<< <i>
<< <i>
<< <i>
<< <i>
<< <i>Which weighs more, a pound of feathers or a pound of lead? >>
The much harder question is: What weighs more, a pound of gold or a pound of feathers.
Since gold is troy and feathers is avoirdupois, a pound of feathers weigh more. >>
They would still weigh the same. >>
No, because a Troy Pound contains 12 Troy ounces, while an avoirdupois pound contains 16 ounces.
12 troy ounces = 0.822857143 pounds (avoirdupois) >>
Lead is measured in avoidupois ounces and pounds, not troy ounces and pounds.
TD >>
He changed the question to a pound of gold versus a pound of feathers.
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
<< <i>The answer is no. A 1943 silver nickel has the same weight and other specs as it's non silver counterpart but their specific gravities are very much different. >>
that's a good point. so I should perform a specific gravity test then. the coins in question are actually dark side items but figured i'd get a quicker response here for a generic question like specific gravity.
This is a tough question to ponder. If the weight is the same and the density is different, then the volumn has to be different - hence, different dimensions.
The surface of a coin has some very irregular dimensions.
You can create your own alloy of metals and come up with the same density as nearly any other material.
You could do an allow of osmium and lithium and come up with the same density of gold, and hence the same specific gravity.
<< <i>The answer is no. A 1943 silver nickel has the same weight and other specs as it's non silver counterpart but their specific gravities are very much different. >>
If the diameters are the same, but the wartime coin is slightly denser than a pre-war nickel, then a type one wartime blank should be slightly thinner than a type one copper-nickel blank.
Had they cared, the Mint could have compensated for this by altering the curvatures of the dies, to make the overall coin slightly thicker at the edge (i.e., back to normal) and thinner in the middle, but the obvious answer is that the difference in thickness was too minor to worry about, since vending machines normally encountered worn coins of slightly lesser thickness.
TD
<< <i>
<< <i>
<< <i>Would two coins with the same dimensions and the same weight have the same specific gravity? >>
The question assumes that the item is perfectly flat on both sides.
A High Relief $20 would weigh less that a gold disc of the same fineness, same diameter and same thickness at the rim!
TD >>
The coins in question actually have the same exact designs. >>
If you are saying that the relief is part of the exact same design, then OK. However, some people consider the High Relief $20 to have the "same design" as the standard relief Saint.
TD
<< <i>
<< <i>
<< <i>
<< <i>Would two coins with the same dimensions and the same weight have the same specific gravity? >>
The question assumes that the item is perfectly flat on both sides.
A High Relief $20 would weigh less that a gold disc of the same fineness, same diameter and same thickness at the rim!
TD >>
The coins in question actually have the same exact designs. >>
If you are saying that the relief is part of the exact same design, then OK. However, some people consider the High Relief $20 to have the "same design" as the standard relief Saint.
TD >>
Nope...same exact design. One is copper-nickel and the other is steel.
Therefore, if you strike a five gram (or whatever) copper-nickel planchet and a steel planchet of the exact same weight from the exact same dies, the steel coin will be thicker in some way than the copper-nickel coin. It has to be.
Now, it may manifest the greater thickness in the fields rather than the rims, so that you are getting an inaccurate reading of "the dimensions" without measuring the thickness of the coins at several places other than the rims. I believe (without looking it up) that the tool for doing this is called a micrometer.
TD
I can't think of any darkside coins made in both cu/ ni and steel. Do you believe this is an off-metal strike?
You don't wanna know and ya' don't wanna hear about MFkZt. Really!
Really? I am surprised. Both nickel and steel are magnetic and I would expect a mixture of the two to be too.
<< <i><<A little alloy such as nickel in steel will render it non magnetic. >>
Really? I am surprised. Both nickel and steel are magnetic and I would expect a mixture of the two to be too. >>
Yes. It's strange isn't it? there are only three very strongly magnetic element but
the two strongest lose the property when mixed. Most stainless isn't magmetic be-
cause of the nickel content primarily.
A lot of world coinage that's made of mixtures is sometimes magnetic and sometimes
not because of small variations.
<< <i>A little alloy such as nickel in steel will render it non magnetic.
I can't think of any darkside coins made in both cu/ ni and steel. Do you believe this is an off-metal strike? >>
2005 People's Republic of China, Yi Jiao, KM-1210a and 1210b. I have about 75 coins from this date, but according to the magnet, they're all steel.
not because of small variations.>>
I remember a physics demonstration in college (1954). They put a USA cent between the poles of a monstrous horseshoe electro-magnet and the cent wanted out. It was suspended by a string and when the magnet was on, it would flip parallel to the poles and equidistant between them. It was diamagnetic. I don't think pure copper is. But this all sort of fuzzy to me now. But it is the only time in my life, I saw a magnet repell something (except the like pole of another magnet).